Mixing depressants is a bad practice. Clonazepam, as said above, has a long life but also as strong as Alprazolam if I remember correct. You should take it easy and not drink alcohol anymore. You could be fine before falling asleep but you could stay asleep from then on. People don't take warnings about mixing the same class of substances (not only depressants but stimulants also) lightly but it could turn fatal quite unexpectedly and rapidly. Be careful, take care and good luck.